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Math problems that are difficult in the senior high school entrance examination
Connection of

OF= 1

Let the side length of a square be x.

Because ∠ o = 45.

So OD=x

So OE=2x

Because of OE? +EF? =OF?

So (2x)? +x? = 1?

Solution: x=√5/5

So the side length of a square is √5/5.

Then subtract the area of triangle and square from the area of big fan.

Finally it should be equal to 1/8π-3/ 10.

(I wonder if there is any miscalculation)

(voiceover: ahem ... classmate, is "a difficult math problem in the senior high school entrance examination" exaggerated? -_-|||)